The standard for normal vision is 1.0 or 5.0. 0.2 vision is definitely abnormal, but what the abnormality is due to requires a trip to the hospital for a dilated eye exam. Because the factors that lead to low vision are not only myopia, but also farsightedness and astigmatism, whichever occurs, can lead to a significant loss of vision, so it is important to go to the hospital to improve the relevant examination. At the same time, it is also necessary to dilate the pupil to check the fundus, because the fundus is the most critical part of seeing, once there is a lesion in the macular area of the fundus, the vision will be significantly reduced. You must develop good eye habits and eye hygiene, don’t look at cell phones and computers for a long time, and don’t stay up late for a long time, which will easily lead to eye overuse and eye fatigue, thus leading to vision loss. You can use eye drops to relieve fatigue, such as heptaerythrone double glycoside eye drops.